Linear chain

Which electrostatic work \(W\) must be applied so that a cation can be removed from this linear chain of ions? Caculate the value in units of electronvolts (eV) and round it to the nearest integer.

The distance between two neighboring ions is \(d = 1 \, \text{Å} = 10^{-10} \, \text{m}\) the charge values are equal to the elemental charge \(q = \pm e = \pm 1.602 \cdot 10^{-19}\, \text{C} \).

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